8.23
Date Code 20171021 Instruction Manual SEL-421 Relay
Settings
Group Settings
Make corresponding zone n = 1–4 settings in Table 8.5 6 and Tabl e 8.57 for any
50QnP settings that are made in Table 8.55.
Make Table 8.58 settings if Group setting E51S := 1–3.
NOTE: If the relay is using a remote
data acquisition system, such as TiDL,
the operating times will be delayed by
1.5 ms. Use caution when setting the
relay coordination times to account
for this added delay.
Table 8.55 Negative-Sequence Instantaneous Overcurrent Pickup
Setting Prompt
Default Value
Increment
5 A 1 A
50Q1P Level 1 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50Q2P Level 2 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50Q3P Level 3 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50Q4P Level 4 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
Table 8.56 Negative-Sequence Definite-Time Overcurrent Time Delay
Setting Prompt Default Value Increment
67Q1D Level 1 Time Delay (0.000–16000 cycles) 0.000 0.125
67Q2D Level 2 Time Delay (0.000–16000 cycles) 0.000 0.125
67Q3D Level 3 Time Delay (0.000–16000 cycles) 0.000 0.125
67Q4D Level 4 Time Delay (0.000–16000 cycles) 0.000 0.125
Table 8.57 Negative-Sequence Instantaneous Definite-Time Overcurrent
Torque Control
a
a
These settings cannot be set to NA or to logical 0.
Setting Prompt Default Value
67Q1TC Level 1 Torque Control (SELOGIC Equation) 1
67Q2TC Level 2 Torque Control (SEL
OGIC Equation) 1
67Q3TC Level 3 Torque Control (SEL
OGIC Equation) 1
67Q4TC Level 4 Torque Control (SEL
OGIC Equation) 1
Table 8.58 Selectable Operating Quantity Inverse Time Overcurrent Element 1
(Sheet 1 of 2)
Setting Prompt
Default Value
5 A 1 A
51S1O 51S1 Operating Quantity (IAn, IBn, ICn, IMAXn, I1L, 3I2L,
3I0n)
a
3I0L 3I0L
51S1P 51S1 Overcurrent Pickup
(0.25–16 A secondary) 5 A
(0.05–3.2 A secondary) 1 A
0.75 0.15
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